I have a question regarding the max speed of diesel engines. On a prototype diesel, is the max speed available under load? Reason for the question: I'd like to as much as possible configure my DCC loco's performance to match the prototype. For example in Wiki it says the max on an SD60 is 70mph. I can put my model on the track and use a stop watch to set the max speed in the decoder to match 70 mph, but of course once I add a string of cars the speed at max throttle is much slower than the one I set under no load conditions.